Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6
authorLinus Torvalds <torvalds@linux-foundation.org>
Mon, 1 Nov 2010 11:50:43 +0000 (07:50 -0400)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 1 Nov 2010 11:50:43 +0000 (07:50 -0400)
* 'next-spi' of git://git.secretlab.ca/git/linux-2.6:
  spi/pl022: fix erroneous platform data in U300
  spi: fixed odd static string conventions in core code
  spi/bfin_spi: only request GPIO on first load
  spi/bfin_spi: handle error/status changes after data interrupts
  spi: enable spi_board_info to be registered after spi_master

arch/arm/mach-u300/spi.c
drivers/spi/spi.c
drivers/spi/spi_bfin5xx.c
include/linux/spi/spi.h

index edb2c0d255c2a1671cae12e6704da28e6b66cb8d..00869def54205c3291b44eafacf3afba7eb03d68 100644 (file)
@@ -67,7 +67,7 @@ static struct spi_board_info u300_spi_devices[] = {
                .bus_num        = 0, /* Only one bus on this chip */
                .chip_select    = 0,
                /* Means SPI_CS_HIGH, change if e.g low CS */
-               .mode           = SPI_MODE_1 | SPI_LSB_FIRST | SPI_LOOP,
+               .mode           = SPI_MODE_1 | SPI_LOOP,
        },
 #endif
 };
index b5a78a1f4421a0c19aa8735bd49f076fd8f91b46..709c836607de23636e6c567a38833cceff752b08 100644 (file)
 #include <linux/spi/spi.h>
 #include <linux/of_spi.h>
 
-
-/* SPI bustype and spi_master class are registered after board init code
- * provides the SPI device tables, ensuring that both are present by the
- * time controller driver registration causes spi_devices to "enumerate".
- */
 static void spidev_release(struct device *dev)
 {
        struct spi_device       *spi = to_spi_device(dev);
@@ -202,11 +197,16 @@ EXPORT_SYMBOL_GPL(spi_register_driver);
 
 struct boardinfo {
        struct list_head        list;
-       unsigned                n_board_info;
-       struct spi_board_info   board_info[0];
+       struct spi_board_info   board_info;
 };
 
 static LIST_HEAD(board_list);
+static LIST_HEAD(spi_master_list);
+
+/*
+ * Used to protect add/del opertion for board_info list and
+ * spi_master list, and their matching process
+ */
 static DEFINE_MUTEX(board_lock);
 
 /**
@@ -300,16 +300,16 @@ int spi_add_device(struct spi_device *spi)
         */
        status = spi_setup(spi);
        if (status < 0) {
-               dev_err(dev, "can't %s %s, status %d\n",
-                               "setup", dev_name(&spi->dev), status);
+               dev_err(dev, "can't setup %s, status %d\n",
+                               dev_name(&spi->dev), status);
                goto done;
        }
 
        /* Device may be bound to an active driver when this returns */
        status = device_add(&spi->dev);
        if (status < 0)
-               dev_err(dev, "can't %s %s, status %d\n",
-                               "add", dev_name(&spi->dev), status);
+               dev_err(dev, "can't add %s, status %d\n",
+                               dev_name(&spi->dev), status);
        else
                dev_dbg(dev, "registered child %s\n", dev_name(&spi->dev));
 
@@ -371,6 +371,20 @@ struct spi_device *spi_new_device(struct spi_master *master,
 }
 EXPORT_SYMBOL_GPL(spi_new_device);
 
+static void spi_match_master_to_boardinfo(struct spi_master *master,
+                               struct spi_board_info *bi)
+{
+       struct spi_device *dev;
+
+       if (master->bus_num != bi->bus_num)
+               return;
+
+       dev = spi_new_device(master, bi);
+       if (!dev)
+               dev_err(master->dev.parent, "can't create new device for %s\n",
+                       bi->modalias);
+}
+
 /**
  * spi_register_board_info - register SPI devices for a given board
  * @info: array of chip descriptors
@@ -393,43 +407,25 @@ EXPORT_SYMBOL_GPL(spi_new_device);
 int __init
 spi_register_board_info(struct spi_board_info const *info, unsigned n)
 {
-       struct boardinfo        *bi;
+       struct boardinfo *bi;
+       int i;
 
-       bi = kmalloc(sizeof(*bi) + n * sizeof *info, GFP_KERNEL);
+       bi = kzalloc(n * sizeof(*bi), GFP_KERNEL);
        if (!bi)
                return -ENOMEM;
-       bi->n_board_info = n;
-       memcpy(bi->board_info, info, n * sizeof *info);
 
-       mutex_lock(&board_lock);
-       list_add_tail(&bi->list, &board_list);
-       mutex_unlock(&board_lock);
-       return 0;
-}
+       for (i = 0; i < n; i++, bi++, info++) {
+               struct spi_master *master;
 
-/* FIXME someone should add support for a __setup("spi", ...) that
- * creates board info from kernel command lines
- */
-
-static void scan_boardinfo(struct spi_master *master)
-{
-       struct boardinfo        *bi;
-
-       mutex_lock(&board_lock);
-       list_for_each_entry(bi, &board_list, list) {
-               struct spi_board_info   *chip = bi->board_info;
-               unsigned                n;
-
-               for (n = bi->n_board_info; n > 0; n--, chip++) {
-                       if (chip->bus_num != master->bus_num)
-                               continue;
-                       /* NOTE: this relies on spi_new_device to
-                        * issue diagnostics when given bogus inputs
-                        */
-                       (void) spi_new_device(master, chip);
-               }
+               memcpy(&bi->board_info, info, sizeof(*info));
+               mutex_lock(&board_lock);
+               list_add_tail(&bi->list, &board_list);
+               list_for_each_entry(master, &spi_master_list, list)
+                       spi_match_master_to_boardinfo(master, &bi->board_info);
+               mutex_unlock(&board_lock);
        }
-       mutex_unlock(&board_lock);
+
+       return 0;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -512,6 +508,7 @@ int spi_register_master(struct spi_master *master)
 {
        static atomic_t         dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
        struct device           *dev = master->dev.parent;
+       struct boardinfo        *bi;
        int                     status = -ENODEV;
        int                     dynamic = 0;
 
@@ -547,8 +544,12 @@ int spi_register_master(struct spi_master *master)
        dev_dbg(dev, "registered master %s%s\n", dev_name(&master->dev),
                        dynamic ? " (dynamic)" : "");
 
-       /* populate children from any spi device tables */
-       scan_boardinfo(master);
+       mutex_lock(&board_lock);
+       list_add_tail(&master->list, &spi_master_list);
+       list_for_each_entry(bi, &board_list, list)
+               spi_match_master_to_boardinfo(master, &bi->board_info);
+       mutex_unlock(&board_lock);
+
        status = 0;
 
        /* Register devices from the device tree */
@@ -579,7 +580,12 @@ void spi_unregister_master(struct spi_master *master)
 {
        int dummy;
 
-       dummy = device_for_each_child(&master->dev, NULL, __unregister);
+       mutex_lock(&board_lock);
+       list_del(&master->list);
+       mutex_unlock(&board_lock);
+
+       dummy = device_for_each_child(master->dev.parent, &master->dev,
+                                       __unregister);
        device_unregister(&master->dev);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);
@@ -652,7 +658,7 @@ int spi_setup(struct spi_device *spi)
         */
        bad_bits = spi->mode & ~spi->master->mode_bits;
        if (bad_bits) {
-               dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
+               dev_err(&spi->dev, "setup: unsupported mode bits %x\n",
                        bad_bits);
                return -EINVAL;
        }
index ab483a0ec6d05b7738ab85aed075ee0a293598bf..3f223511127b56c9a6800743991aea342e5e2e92 100644 (file)
@@ -504,6 +504,15 @@ static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id)
                "in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
                dmastat, spistat);
 
+       if (drv_data->rx != NULL) {
+               u16 cr = read_CTRL(drv_data);
+               /* discard old RX data and clear RXS */
+               bfin_spi_dummy_read(drv_data);
+               write_CTRL(drv_data, cr & ~BIT_CTL_ENABLE); /* Disable SPI */
+               write_CTRL(drv_data, cr & ~BIT_CTL_TIMOD); /* Restore State */
+               write_STAT(drv_data, BIT_STAT_CLR); /* Clear Status */
+       }
+
        clear_dma_irqstat(drv_data->dma_channel);
 
        /*
@@ -1099,12 +1108,15 @@ static int bfin_spi_setup(struct spi_device *spi)
        }
 
        if (chip->chip_select_num >= MAX_CTRL_CS) {
-               ret = gpio_request(chip->cs_gpio, spi->modalias);
-               if (ret) {
-                       dev_err(&spi->dev, "gpio_request() error\n");
-                       goto pin_error;
+               /* Only request on first setup */
+               if (spi_get_ctldata(spi) == NULL) {
+                       ret = gpio_request(chip->cs_gpio, spi->modalias);
+                       if (ret) {
+                               dev_err(&spi->dev, "gpio_request() error\n");
+                               goto pin_error;
+                       }
+                       gpio_direction_output(chip->cs_gpio, 1);
                }
-               gpio_direction_output(chip->cs_gpio, 1);
        }
 
        dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
index 92e52a1e6af3fd8478bb451f04d34a3c63b1625f..b4d7710bc38d2b26effd6025243150490e0a26a9 100644 (file)
@@ -204,6 +204,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
 /**
  * struct spi_master - interface to SPI master controller
  * @dev: device interface to this driver
+ * @list: link with the global spi_master list
  * @bus_num: board-specific (and often SOC-specific) identifier for a
  *     given SPI controller.
  * @num_chipselect: chipselects are used to distinguish individual
@@ -238,6 +239,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
 struct spi_master {
        struct device   dev;
 
+       struct list_head list;
+
        /* other than negative (== assign one dynamically), bus_num is fully
         * board-specific.  usually that simplifies to being SOC-specific.
         * example:  one SOC has three SPI controllers, numbered 0..2,